the word is:Guise [gahyz] In halloween, it is popular to guise your self in a costume.
a form or style of dress: COSTUME (m-w.com)

external image karsonDisguise.jpghttp://www.gallagherstravels.com/States/DC/spymuseum/classified/images/karsonDisguise.jpg

synonyms: Costumes, disguse, cover
antonyms: serious, uncover, known.
During Halloween everybody wants to guise them selves as somthing funny or cute. Last year I dressed up as batwoman. My favorite guise thogh was when i was Alice in Wonderland. That Halloween i was with my friends john luke and a pew other people i can't remember. John's guise was je